Dominance Hierarchy and Mating Behavior of the Formosan Squirrel, Callosciurus erythraeus thaiwanensis

Tamura, Noriko; Hayashi, Fumio; Miyashita, Kazuyoshi

doi:10.2307/1381382

Cited by 29 publications

(17 citation statements)

References 20 publications

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“…Observations of predation on the nests of native birds have been reported in the Pampas (Pereira et al 2003). Studies conducted in Japan, where it was first introduced in 1935, have reported high population growth and adaptability to new environments, damage to plantations, garden trees, and cables, and predation of native birds (Tamura et al 1988, 1989, Azuma 1998, Miyamoto et al 2004). The species was also introduced into France in the 1970s, where it now causes damage to trees and crops (Jouanin 1992).…”

mentioning

confidence: 99%

Invasion dynamics of an introduced squirrel in Argentina

Guichón¹,

Doncaster²

2008

Ecography

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Biological invasions are one of the major threats to both ecosystem and economic functioning. Their management typically involves culling of the pest or removal of its habitat. The Asiatic red-bellied beautiful squirrel Callosciurus erythraeus is the first known introduction of a squirrel into South America. It established from five releases in 1973, using exotic trees to spread through Argentinean Pampas. It now causes substantial economic damage in agricultural and urban areas across 680 km 2 , and its continued spread threatens indigenous species. We developed a spatially explicit model of the invasion for the likely range of life-history parameters, matched against empirical data on patch occupancy in 2004. The two best-fitting models suggest the current population to be on the cusp of an explosive expansion. These models were used to predict future trends under alternative scenarios of strategic culling or habitat removal aimed at slowing the spread. The predictions for 18 yr into the future were that 1) the present lack of systematic management will lead to a 5fold increase in area of occupancy, 2) removal of habitat down to half carrying capacity will thin the population but accelerate its spread, 3) 10 yr of culling above the maximum sustainable yield (MSY) will precipitate declines in abundance and patch occupancy towards extinction, but with immediate recovery upon cessation of the cull. We recommend continuous culling above the MSY in priority patches, aimed at slowing arrival to valuable conservation areas. This study demonstrates the need for prompt action to terminate invasions before they establish. The squirrel invasion is now irreversible after 30 yr of slow spread across fragmented habitat. Although culling requires public awareness campaigns and sustained governmental commitment, it is now the best feasible strategy for managing this invasion.

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mentioning

confidence: 99%

Invasion dynamics of an introduced squirrel in Argentina

Guichón¹,

Doncaster²

2008

Ecography

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“…Body weight, sex, and maturity were recorded each time that squirrels were captured. Further information on the study site and trapping methods is available in Tamura et al (1988Tamura et al ( , 1989, When I encountered a squirrel along the census routes, individual identification, location, time, and behaviour were recorded. When vocalizations were detected, I recorded the location and behaviour of the caller, the target of calling, the total duration of calling, and the reactions of neighbouring squirrels.…”

Section: Field Observationmentioning

confidence: 99%

“…The speaker was located at 5 m from an artificial feeding stand established in the centre of the 7-ha study area. At least 15 different individuals used the feeding stand, and the maximum number of squirrels observed at one time near the feeding stand was nine (Tamura et al 1988). The feeding stand was 1 m in height and surrounded by several large trees (Castanopsis cuspidata, Camellia japonica, Hovenia dulcis, and Cryptomeriajaponica) clustered into a stand (10 x 10 m) separated from surrounding forests.…”

Section: Playback Experimentsmentioning

confidence: 99%

“…Detailed behaviour in mating bouts was summarized in Tamura et al (1988) based on 19 mating bouts observed from 1982 to 1985. The following description is based on 28 mating bouts (19 bouts in 1982-1985 and 9 bouts of 1986-1988) observed in Kamakura.…”

Section: Vocalization In Mating Boutsmentioning

confidence: 99%

“…Because the feeding stand was small and occupied by the dominant individual who chased the subordinates (Tamura et al 1988), some squirrels were waiting in the trees near the feeding stand. All the squirrels near the feeding stand was able to see each others, movements.…”

Section: Playback Experimentsmentioning

confidence: 99%

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Postcopulatory mate guarding by vocalization in the Formosan squirrel

Tamura

1995

Behav Ecol Sociobiol

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The Formosan squirrel, Callosciurus erythraeus thaiwanensis, emitted different vocalizations in response to terrestrial and aerial predators and snakes. Each vocalization caused nearby individuals to adopt a different type of anti-predator behaviour. In mating bouts, males produced two types of loud calls: precopulatory calls, emitted before copulations, and postcopulatory calls, emitted after copulations. The latter continued for 17 min on average. The estrous female and other males attending the mating bouts stopped moving during the postcopulatory call, so that the calling male was able to tend the female without interruption. The sound characteristics of anti-terrestrialpredator and postcopulatory calls recorded in the captivity were compared, and none of the ten characters of duration and frequency measured differed between the two calls. Playback experiments also showed that responses to the sounds in two different contexts, escape behaviour and defensive immobility, did not differ. The similarity between anti-predator and postcopulatory calls is discussed with reference to the possibility of manipulation and other explanatory hypotheses.

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A guide to the literature on aggressive behavior

1989

Aggr. Behav.

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Dominance Hierarchy and Mating Behavior of the Formosan Squirrel, Callosciurus erythraeus thaiwanensis

Cited by 29 publications

References 20 publications

Invasion dynamics of an introduced squirrel in Argentina

Invasion dynamics of an introduced squirrel in Argentina

Postcopulatory mate guarding by vocalization in the Formosan squirrel

A guide to the literature on aggressive behavior

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